Dex appears to be the voice of reason amongst the other lieutenants and is a superb tactician and would rather plan than just going in guns blazing, which he tries to talk a trigger happy Johnny Gat out of doing.[12] In the final mission for the Carnales, Dex along with the player take down Angelo Lopez, finally finishing the Carnales gang.[8] He appears in the second epilogue mission when taking down corrupt Chief Monroe who is holding Julius.[13]

During Saints Row 2, Dex now works as the Head of Security for Ultor and is a successful millionaire,[14] leaving behind his life as a gang member. He doesn't appear in person during the game, but is mentioned a couple of times,[15][14] and the player is required to phone him to unlock the mission Revelation, which leads to Dex betraying both The Protagonist and Julius after luring them there.[16] In the second DLC for the game Corporate Warfare, Dex attempts to have newly appointed CEO of Ultor Eric Gryphon killed,[2] while partaking in illegal nuclear waste smuggling.[17] In the end, he ends up having to flee Stilwater to an unknown location after The Protagonist ruins his plans.[18]

Dex was one of the people affected by gang violence spreading throughout Stilwater and thus joined the gang formed by Julius Little, the 3rd Street Saints, to rid the city of its chaotic state. Dex appeared to be the voice of reason amongst Little's lieutenants. Dex is a superb tactician, but talk amongst the generic Saints gang members that wander the streets indicate that few Saints believe that Dex deserved his post and there was concern that Dex might have eventually challenged Julius Little for control of the gang.

Before The Protagonist was blown up on Alderman Richard Hughes' boat, Dex dropped his flags after he was offered a job in Ultor by Dane Vogel at the Saints' church. He called Troy Bradshaw after this happened, telling him that he knew Troy was a cop and he was out of the Saints, and wanted to make sure he and Troy won't have a problem (due to Troy being able to arrest him).[19]

The Protagonist visits the police station and listens to the conversations that were taped. He finds out that it was Julius who put the bomb on Alderman's boat. He also finds Dex's file containing his phone number. The Protagonist calls Dex and he tells The Protagonist to come meet him at the church so that they can get rid of Julius.[19] However, this ends up being a trap set up by Dex and instead of Dex, Julius shows up. After a conflict between Julius and The Protagonist, a smoke bomb is thrown through the church's window.[16] Masako agents sent by Dex attack the two, who ally briefly to escape.[19]

Some time after, Eric Gryphon, Ultor's new CEO, visited the Saints telling them that he wanted protection from the Masako who were sent by Dex to kill Gryphon. The Protagonist successfully protected Gryphon from Dex's assassination attempt. After this Gryphon and Dex met in front of the Phillips Building and talked about Dex's attempt.[2]

Then Gryphon informed The Protagonist that Dex is selling toxic waste to illegal buyers. The Protagonist, with help from Ultor security, succeeded in stopping Dex's plan. Dex felt the heat closing in on him and asked for an immediate transfer to another Ultor branch.[17]

Gryphon again informed The Protagonist that Dex fled and that he couldn't do anything. However, The Protagonist still wanted to hurt Dex hard and Gryphon came up with a plan. While Gryphon is standing on the lighthouse informing The Protagonist of any of Dex's acquaintances walking around, The Protagonist killed them. After this happened, The Protagonist said he would find out which city Dex ran to and to get him.[20]

Dex's days of hiding have finally come to an end. After deducing his present location, Ultor dispatches a professional female assassin named Cypher to take him out. Using some very sophisticated sniper technology, Cypher makes her move on Dex in the midst of his big corporate birthday party; swiftly disposing of him with a bullet to the head.

Dex resembles a normal undead Civilian wearing Dex's hat, and randomly spawns around New Hades and appears on the minimap.[21] The "Revenge" Diversion requires killing him 7 times.[22]

The first few times he spawns, Dex is unarmed and alone. After that, he has a firearm and demon allies, starting with Imps and getting stronger demons with each kill. After being killed 6 times, he spawns with 2 Legionnaires. After being killed the 7th time, this resets and Dex goes back to spawning alone and unarmed, and he continues to spawn indefinitely, with the upgrade cycle repeating.

He only receives additional firepower and allies when he is killed, if his demon followers are killed, but he is left alive, he does not upgrade his followers.[details?]

Killing Dex's Legionnaires is an easy way to get the "Kill Legionnaires" challenge, but he may spawn with his extra demons at an inconvenient time. At max Notoriety when an Archduke spawns, Dex is removed along with all the other demons.

Julius can be unlocked as a homie in Saints Row IV. Therefore Dex is the only Saint to never become an unlockable homie.

Near the end of Saints Row, Saints may be heard saying "You aren't worried Dex might pull some Warren Williams bullshit, are you?", foreshadowing him becoming an enemy of the Saints in Saints Row 2.

Dex's hair, grammar, clothing style, and even voice, have changed dramatically from Saints Row to Saints Row 2. This suggests that he was very young in the first game, a teenager. This could also be down to him being in a well paid job and lifestyle, differing from being a gang member.

Dex sometimes appears again in the phone after completing "Revelation", and if he is called, the mission is sometimes unlocked again and can be played without using the Newspaper Clipboard.

In a livestream interview with Destructoid one week prior to the release of Saints Row: The Third, Steve Jaros, one of the writers of the Saints Row series, confirmed that Dex does not appear in Saints Row: The Third. Jaros further explained that Dex was to appear in another project which "never materialized", and Volition, Inc. did not want to put Dex in the game and alienate players who did not play Saints Row or the Saints Row 2 DLC Corporate Warfare.[25]

The unreleased Saints Row: Money Shot bridges some of the gap between the second and third games. If the events of this game occurred off-screen, then Dex is dead by the events of Saints Row: The Third and, as of Saints Row: Gat out of Hell, Johnny is the only original character who is still alive.[27]

In the Saints Row IV mission "A Pleasant Day", Dex is referenced to by The Protagonist's "wife" in a simulation who says that Dex had called round but she didn't recognize him so sent him away. The Protagonist doesn't react to this while they are eating pancakes.[28]

Dex and Killbane are two major antagonists who survive the events of their respective games (Corporate Warfare and Saints Row: The Third), die "offscreen", and then return as minor characters in Saints Row: Gat out of Hell. Also, The Protagonist expresses a deep hatred for both of them as enemies of the Saints.

Jane Austen mentions in the Shawarma cutscene that Dex's retribution was long overdue. A reference to Dex's absence from the series after Corporate Warfare.[23]

The Gat out of Hell website promo image of Dex uses the Saints Row Wiki's image of Dex in the Corporate Warfare Milestone Goal Failed cutscene without attribution.[31][32]

Dex: "Johnny, your idea of a plan is taking the biggest hammer you can find and smashing whatever's in your way."Johnny Gat: "That sounds like a plan to me."Dex: "Yeah, a shitty one, as your whack ass robo-leg clearly proves."Johnny Gat: "Oh, fuck you."Dex: "Next time you try that cowboy shit, you might not walk away at all."